linux-kernel - Re: [PATCH] slub: Avoid direct compaction if possible

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Date:	Mon, 17 Jun 2013 14:44:54 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Roman Gushchin <klamm@...dex-team.ru>
cc:	Michal Hocko <mhocko@...e.cz>, Christoph Lameter <cl@...two.org>,
	penberg@...nel.org, mpm@...enic.com, akpm@...ux-foundation.org,
	mgorman@...e.de, glommer@...allels.com, hannes@...xchg.org,
	minchan@...nel.org, jiang.liu@...wei.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] slub: Avoid direct compaction if possible

On Mon, 17 Jun 2013, Roman Gushchin wrote:

> > FWIW, there were some compaction locking related patches merged
> > around 3.7. See 2a1402aa044b55c2d30ab0ed9405693ef06fb07c and follow ups.
> 
> Thanks, Michal.
> I've already tried to backport some of those patches, but it didn't help
> (may be it wasn't enough).

They certainly aren't enough, the kernel you're running suffers from a 
couple different memory compaction issues that were fixed in 3.7.  I 
couldn't sympathize with your situation more, I faced the same issue 
because of thp and not slub (we use slab).

> I'll try to reproduce the issue on raw 3.9.
> 

Thanks.  If you need to go back to 3.4, try using these, they 
significantly helped our issues:

bb13ffeb9f6bfeb301443994dfbf29f91117dfb3
627260595ca6abcb16d68a3732bac6b547e112d6
c89511ab2f8fe2b47585e60da8af7fd213ec877e
62997027ca5b3d4618198ed8b1aba40b61b1137b
a9aacbccf3145355190d87f0df1731fb84fdd8c8
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